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It may be that observation_sources and plugins are not connected. You can probably subscribe with the following

Local_costmap_params.yaml:

global_frame: odom
robot_base_frame: base_link 
update_frequency: 6.0
publish_frequency: 5.0 
static_map: false
rolling_window: true 
width: 10.0
height: 10.0
resolution: 0.05

plugins:
 - {name: obstacles_laser,           type: "costmap_2d::ObstacleLayer"}
 - {name: inflation,                 type: "costmap_2d::InflationLayer"}

# add
obstacles_laser:
  observation_sources: laser_scan_sensor
  laser_scan_sensor: {sensor_frame: laser_frame, data_type: LaserScan, topic: scan, marking: true, clearing: true}